Traffic Control Devices

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This guideline covers various types of positive protection devices that can be easily placed and moved for short duration and short term work operations, especially compared with traditional portable …More

Lane width evaluation is one of the crucial aspects in road safety inspection. Moreover, lane width is one of the most important attributes of a road digital map for many applications, such as driver …More

This report presents the results of research to develop recommendations to (1) improve the vehicle and equipment warning light policy for the Texas Department of Transportation, and (2) improve the sa…More

In the year 2015, in the United States, a work zone crash occurred once every 5.4 minutes, according to the Federal Highway Administration (FHWA). Work zone barriers can help reduce the risk to the wo…More

Temporary barrier is effective in providing positive separation between traffic and work areas. It is primarily used for protecting vehicles from severe hazards (e.g. drop -offs, embankments, fixed ob…More

This course is an introductory course on the operation and application of TMAs in work zones. The course applies workable concepts, applications, and recommended practices in the deployment, operation… More

This course is designed to teach students how to effectively teach Truck-Mounted Attenuator (TMA) courses. This train-the-trainer course emphasizes skills and techniques for teaching the fundamentals … More

Speeding in a work zone needs to be tackled effectively to enhance work zone safety. This study evaluates the influence of three different work zone signs – speed photo enforced signs, dynamic speed…More

A truck hauling cargo overturned and fell off the side of a highway in Mendocino County Thursday after its driver, Christopher Cortez, ignored multiple signs notifying motorists that any vehicle over …More

The aim of this report was to review the literature to identify existing best practices used to prevent incursions into work zones and improve safety of road users and road workers. A systematic liter…More

Daily sightings of traffic cones were logged over a six-month period in an attempt to provide data about the frequency and novelty of such encounters, and to yield examples of the variety of uses …More

Pavement markings and signs are important traffic control devices used to guide and regulate traffic movement through visual information presented to motorists. Signs and markings are made with retror…More

Several work-zone traffic control devices have not yet been evaluated to the American Association of State Highway and Transportation Officials' (AASHTO's) Manual for Assessing Safety Hardware, Second…More

Truck-mounted attenuator (TMA) has been used as a countermeasure to help improve safety in mobile work zones. However, 139 TMA crashes occurred in Missouri from 2012 to 2017 with distracted driving be…More

Eight trucks went off the highway since April. Those crashes have coincided with highway lanes narrowing and shifting caused by an I-270 widening project. To prevent such crashes in the future, Ohio D…More

The California Department of Transportation has used Type 60 Median Barrier since it passed the National Cooperative Highway Research Program (NCHRP) Report 350 safety guidelines and became a Standard…More

The use of green versus traditional amber lights on Truck Mounted Attenuators (TMAs) was investigated to see if their use could help to improve safety in mobile work zones. Four light color configurat…More

The lane-changing behavior in work zone areas has special features than a regular lane change as the former is usually compulsively motivated involving complicated cognitive processes with drivers’ …More

Work zone safety affects both drivers and construction workers. Two main safety measures for reducing work zone crashes and their severity have been to reduce the vehicle speeds in work zones and to i…More

Reducing the potential for crashes involving front line service workers and passing vehicles is important for increasing worker safety in work zones and similar locations. Flashing yellow warning beac…More

The I-65 construction has caused a traffic gridlock in downtown Indianapolis. Frustrated commuters turned to Call 6 for help and Call 6 Investigates took their concerns to the city and the state. …More

Temporary traffic control, also known as maintenance of traffic, is critical to minimizing congestion and maintaining mobility during planned and unplanned activities as well as providing a safe work …More

Portable light towers are a significant source of glare to motorists entering a work zone. Although existing research has evaluated the effect of light tower orientation on visibility and glare, the e…More

Work zones include advance warning area, transition area, and activity area. The geometric, traffic control aspects, traffic operations, and driver’s maneuverability differ within each work zone are…More

A current concern in roadway construction is the behavior of drivers in response to the location and frequency of construction and permanent signage prior to and within the construction work zone. A r…More

Roadway lanes are often repositioned to accommodate highway work operations, resulting in a need to alter pavement markings. Even the most effective methods for removing old pavement markings sometime…More

A total of 112 Tennessee Department of Transportation (TDOT) workers have died in the line of duty since 1948. TDOT invested in new LED sign paddles in hopes of lowering the number of workers injured …More